Yellow-olive dye and process of making same.



UNITED STATES "PATENT OFFICE.

ERIOH SAUL, 0F FRANKFOBT-UN-lHE-MAIN, GERMANY, ASSIGNOH TU CASH LLA COLOR COMPANY, OF NEW YOltlx', N. Y.

YELLOW-OLIVE DYE AND PROCESS OF MAKING SAME.

Specification of Letters Patent.

Patented Nov. 24, 1908.

Application filed December 31, 1907. Serial No. 408,859.

To all whom it may concern.

Be it known that I, Enron SAUL, a citizen of Germany, and a resident of Frankfort-onthe-Main, Kingdom of Prussia, have invented a new and useful Yellow-Olive Dyestutl' and Process of Making Same, of which the following is a specification.

I have discovered that by melting metatoluylenediamin and para-phenylenediainin together with sulfur, a body is obtained which on being heated with. concentrated so lutions of alkaline sulfids or caustic alkalies, is transformed into a dyestufl' soluble in wa ter. This dyestufl may be obtained b recipitation from the diluted melt, an yes from a sodium sulfid bath unmordantcd cot ton yellow-olive shade of a fastness to washing, light and chlorin hitherto .unat-- tainable. As such khaki shades are of importance for dyers, the new coloring matter is of particular technical value.

The new process of manufacture is illustrated by the followingcxamples 1- Example I: 12 kilos para-phenylenediamin, together with 10 kilos meta-toli.1ylenediamin and kilos sulfur, are heated gradi uiordanted cotton from such solution in fast ually to 200 (3.; the temperature is then raised and ke Jt for about four hours at 200-240 C. l verized, and as much as three times the weight of crystallized sodium sultid added. together with a little water; this mixture is heated to and kept at 115 C. until a sample taken from the melt keeps clear on being (liluted. The melt is then diluted with cold water and the dyestufi precipitated with dilute acids, or by the introduction of air, or by the addition of salts of lime, salts of ammonia, etc., etc.

Instead of heating the toluylenediamin and the phenylenediamin at once with sulfur, the melt may he performed in two 0 or ations by first producing the so-called t iotoluylenediamin from meta-toluylenediamin and sulfur, and heating this thioderivative with para-phenylenediamin.

Vhen cold the melt is pul- Example I I: The thiocompound obtained by heating 42.2 kilos meta-toluylenediamin and 150 kilos sulfur for eight hoursat a temperature of 185 C is ulverized together with 50 kilos parapheny enediamin, and the mixture is kept at about 220 C. for some hours. The melt is then treated exactly as described in Example I.

The thus produced coloring matter shows the following characteristics. It is insoluble in neutral or acid solutions, almost insoluble in concentrated sulfuric acid, easily soluble in the presence of alkaline sulfide with a yellowish brown color and dyes unniordzmted cotton from such a solution in yellow-olive shades.

Having now described my said invention and in what manner the same is to be performed, what I claim is:

1. The yellow olive dyestufl which is proi duced by melting meta-toluylenediamin and parzuphenvlenediamin together with sulfur and transforming the roduct into a soluble compound which is a ark powder insoluble in neutral or acid liquids, easily soluble in presence of alkaline sulfide and dyeing unellow-olive shades substantially as described.

2. The Erocess of producing a yellow-olive dyes-tuft y melting meta-toluylenediamin and para-phenylenediamin together with sulfur and transforming the product into a soluble compound by heating it with alkaline sulfids or caustic alkalies substantially as described.

In witness whereof I have hereunto si ed my name this 17th day of December 190 in the presence of two subscribing witnesses.

ERICH SAUL.

VVitucsses JEAN GRUND, CARL GRUND. 

